Planet + Includes
Triton + Primary
Sun + Satellite
| Neptune |
Albedo
0.41
Apoapsis
4.54567e+9 km (30.386 AU, 2.82455e+9 mi)
Axial tilt
0.494 rad (28.32 °, 31.467 grad)
Circumference
188.925 AU (2.82628e+10 km, 1.75617e+10 mi)
Color
#3366FF
Composition
80% [[hydrogen]], 19% [[helium]], 1.5% [[methane]], 192 ppm hydrogen deuteride, 1.5 ppm [[ethane]], aerosol traces of [[ammonia]] ice, [[water]] ice, [[ammonia hydrosulfide]], and methane ice.
Creation magnetic moment
2.42e+25 N-m/T
Date of discovery
23 September 1846
Equatorial radius
24,764 km (15,387.636 mi)
Escape speed
23.5 km/s (84,600 km/h, 14.602 mi/s, 52,568.003 mph)
Inclination
0.0309 rad (1.769 °, 1.966 grad)
Magnetic decay time
2,200 a (803,550 da)
Magnetic half life
1,525 a (557,006.25 da)
Mean radius
24,622 km (15,299.401 mi)
Mean temperature
53 K (-220.15 °C, -364.27 °F, 95.4 °R)
Orbital eccentricity
0.0113
Orbital speed
5.432 km/s (19,555.2 km/h, 3.375 mi/s, 12,151.038 mph)
Order
9
Periapsis
4.44445e+9 km (29.709 AU, 2.76165e+9 mi)
Planet density
1,638 kg/m³ (1.638 g/ml, 102.257 lb/ft³)
Planet mass
1.0243e+26 kg (17.14 M⊕, 0.0539 M♃)
Planet surface area
7.619e+9 km² (2.94171e+9 mi², 14.937 A⊕, 0.123 A♃)
Polar radius
24,341 km (15,124.796 mi)
Present magnetic moment
1.5e+24 N-m/T
Satellites
13
Semi-major axis
4.49506e+9 km (30.048 AU, 2.7931e+9 mi)
Sidereal day
16.11 h (0.671 da)
Sidereal period
60,189.548 da (164.79 a)
Surface gravity
11 m/s² (36.089 ft/s², 1.122 g)
Surface magnetic flux density
1.42e-5 T
Symbol
♆
Synodic period
367.49 da (1.006 a)
Titius-Bode prediction
38.8 AU
Discoverer
Heinrich L. d'Arrest +, Urbain Le Verrier +, John Couch Adams +, Johann Gotfried Galle +
Member of
Planet +
Primary
Sun +
Categories Astronomy +, Planet +, Solar system +
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